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Why is gunner500's 570-grainer at just under 1300 fps such a great penetrator ?



At 1250 fps, penetration of game is about 50" for the test bullet above.
Double the velocity to 2500 fps and penetration is improved little, to about 56".
Tissue resistance is greater at higher velocity, exponentially so, even for an FN solid.
A soft might penetrate even less at higher velocity, because the greater frontal area from expansion of bullet really puts the brakes on,
if the bullet does not disintegrate at a shallow depth of penetration, though wound cavity may get interesting if it does ...